Ferrosilicon is an iron-silicon alloy smelted by electric furnace with coke, steel chips, quartz (or silica) as raw materials. Because silicon and oxygen are easy to combine into silicon dioxide, iron silicon is often used as a deoxidizing agent in steelmaking. At the same time, due to the release of a lot of heat during the generation of SiO2, it is also favorable to improve the temperature of molten steel during deoxidation. At the same time, ferrosilicon can also be used as alloying element additive, widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, ferrosilicon in ferroalloy production and chemical industry, commonly used as reducing agent.

It is used as a inoculant and spheroidizing agent in the cast iron industry. Cast iron is an important metal material in modern industry, it is cheaper than steel, easy to melt and smelt, has excellent casting performance and much better seismic ability than steel. In particular, the mechanical properties of nodular cast iron are at or close to those of steel. Adding a certain amount of ferrosilicon to cast iron can prevent the formation of carbide in iron and promote the precipitation and spheroidization of graphite, so in the production of nodular cast iron, ferrosilicon is an important inoculant (help precipitate graphite) and spheres